Air-presser.



No. 805,198. PATENTED NOV. 21, 1905. A. H. GIBSON.

AIR PRESSER. APPLICATION FILED MAY27,1905.

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UNITED STATES PATENT OFFICE.

ARTHUR H. GIBSON, OF EASTON, PENNSYLVANIA, ASSIGNOR TO THE INGERSOLL-SERGEANT DRILL COMPANY, OF NEW YORK, N. Y., A CORPORATION OF WEST VIRGINIA.

AIR-PRESSER.

Specification of Letters Patent.

Patented Nov. 21, 1905.

To a whont it may concern:

ton is moved back and forth by reciprocating columns of air, the present invention being i evoted to means for raising the pressure of the air columns and maintaining the pressure in a very simple and effective manner without the use of an auxiliary cylinder or of valves in the tubes connecting the tool and presser cylinders.

In the accompanying drawings, Figure 1 represents in longitudinal central section such parts of a rock-drill andair-presser as will give a complete understanding of this invention; and Fig. 2 is a fragmentary section of the presser-cylinder, taken at right angles to the plane of the section in Fig. 1.

The tool-cylinder, which is herein represented as a rock-drillcylinder, is denoted by 1 and its piston by 2. The chamber 3 of the toolcylinder is provided at the ends of the cylinder with ports A and 5, which are in communication with the corresponding ends of two flexible tubes 6 and 7., The other ends of these tubes communicate with ports 8 and 9 in the presser-cylinder 11.

The port 8 is spaced a short distance from the outer end of the presser-chamber 10, so that the said port is closed by the hollow piston 12 as it nears the limit of its outer movement. This hollow piston 12 is provided with a hollow trunk 13, which is fitted to slide in the inner cylinder-head 14, which is in the present instance developed to form a closed crank-shaft casing 15, the chamber of which is in open communication at all times with the interior of the hollow piston.

The crank-shaft is denoted by 16, to which is attached the inner end of a pitman-rod 17, the outer end of which is connected to the piston 12 within the hollow trunk 13; This crankshaft 16 may be driven from any wellknown or approved motor. (Not shown here- An induction-port 18 is located in the outer cylinder-head 19 of the presser, communicationthrough which port is controlled by an induction-valve 20. A light spring 21 is used for normally holding the induction valve closed. A discharge-port 22 is also formed in the outer cylinder-head 19, which port communicates, through a passage 23, formed by suitable piping, with a port 26L, formed in the inner cylinder-head 14 in such position that it is brought into open communication with the closed crank-chamber when the piston is near the limits of its outward movement.

A discharge-valve is arranged to control communication from the outer end of the presser-chamber 10 to the passage 23, which discharge-valve is normally held closed by a light spring 26.

A port 27 is formed through the peripheral wall of the hollow piston 12 and is arranged to coact with a bridge-port 28, formed in the wall of the chamber 10 near its outer end, so that open communication is established from the interior of the piston to the interior of the chamber 10 at the inner side of the piston when the piston is at the limit of its outward movement. Another port 29 is formed through the peripheral Wall of the hollow piston 12 in a different radial position from the port 27, which port 29 is arranged to coact with a bridge-port 30 in the wall of the chamber 10 near the inner end of the chamber, whereby open communication is established from the interior of the piston to the chamber at the outer side of the piston.

In operation, supposing the parts to be in the position which they assume in the drawings, with the piston at the limit of its outward movement, the interior of the piston, and thereby the closed crank-chamber, being in open communication through the ports 27 and 28 with the chamber 10 at the inside of the piston, as the crank-shaft is rotated to move the piston inwardly the early part of its inward movement will close communication through the ports 27 and 28 and will draw air from the exterior by the inductionvalve 20 into the chamber 10 until the piston opens up the port 8 of the tube 6. As the piston continues its inward movement the column of air forced through the tube 7 will move the tool piston 2 forward. As the presser-piston reaches the limit of its inward movement open communication will be established between the closed crank-chamber and the presser-chamber outside the piston 12 through the piston-port 29 and bridge-port 30. As the presser-piston is moved outwardly it will first cut off communication through the ports 29 and 30 and will force the column of air through the tube 6 into the tool-cylinder in position to exert its force upon the front of the tool-piston 2 to move it rearwardly. As the piston 12 approaches the limit of its outward movement it will close the port 8, and as it completes its movement it will force the remaining volume of air in front of the piston past the discharge-valve 25 and from thence through the passage 23 and port 2L into the closed crank-chamber, thus raising the pressure within the crank-chamber and piston. As the piston reaches the limit of its outward movement its port 27 will open communication from the interior of the closed crank-chamber and piston through the bridgeport 28 into the chamber 10 back of the piston, thus raising the pressure in the chamber 10.

Vhat I claim is 1. In combination, a tool-cylinder, its piston, apresser-cylinder, its hollow piston, tubes connecting the two cylinders, a port through the peripheral wall of the presser-piston and a bridge-port in the wall of the cylinder arranged to coact with each other to open communication from the interior of the piston to the interior of the presser-cylinder when the piston is at the limit of its movement in one direction.

2. In combination, a tool-cylinder, its piston, a presser-cylinder, its hollow piston, a closed crank-chamber in open communication with the interior of the piston, a port through the peripheral wall of the piston and a bridgeport in the wall of the cylinder arranged to coact with each other to open communication from the interior of the closed crank-chamber 4:. In combination, a tool-cylinder, its piston, a presser-cylinder, its hollow piston, tubes connecting the two cylinders, a closed crank-chamber in open communication with the interior of the hollow piston, separate ports through the peripheral wall of the piston and bridge-ports in the inner wall of the cylinder arranged to coact with the separate ports to alternately open communication from the closed crank-chamber through the interior of the piston to the interior of the pressercylinder upon opposite sides of the piston.

5. In combination, a presser-cylinder, its hollow piston having an open-ended trunk, and induction and discharge valves at the outer end of the presser-cylinder, a closed crank-chamber in communication with the interior of the hollow piston and a passage leading from the discharge-valve arranged to be opened and closed to the said crank-chamber by the movement of the piston-trunk.

6. In combination, a presser-cylinder, its hollow piston having an open-ended trunk, induction and discharge valves at the outer end of the presser-eylinder, a closed crankchamber in open communication with the in-' terior of the hollow piston, ports arranged to alternately open the interior of the piston to the interior of the presser-cylinder upon opposite sides of the piston and a passage leading from the discharge-valve arranged to be opened and closed to the crank-chamber by the movement of the piston-trunk.

7. In combination, a tool-cylinder, its piston, a presser-cylinder, its hollow piston having an open-ended trunk, tubes connecting the two cylinders, the presser-cylinder port of one of the tubes being located a distance from the outer end of the cylinder, induction and discharge valves at the outer end of the ARTHUR'H. GIBSON. Witnesses:

FREDK. HAYNES, HENRY THIEME.

Corrections in Letters Patent No. 805.198,

It is hereby certified that in Letters Patent No. 805,198, granted November 21, 1905,

upon the application of Arthur H. Gibson, of Easton, Pennsylvania, for an improvement in Air-Pressors, errors appear requiring correction, as follows: In the grant,

title, specification, and claims the word presser wherever it occurs should read pressor and the word pressers should read pressors; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Ofiice.

Signed and sealed this 5th day of December, A. D., 1905.

[SEAL] 1 F. 1. ALLEN,

Commissioner of Patents. 

